v0.3.0

TerraformCommand supports all Terraform commands.
Compared with v0.2.1, the current version supports the following commands:

• fmt
• force unlock (The corresponding function is force_unlock)
• graph
• import (The corresponding function is import_resource)
• refresh
• state and all sub commands of state
• taint
• untaint
• test
• workspace and all sub commands of workspace

The project adds Makefile so we can use make command, like make init, make test, make build etc.